Just for clarification...are you saying that the "same" old battery has become deeply discharged and your removed it to recharge the battery? Then once the old battery was reinstalled, it still didn't start with the key your were using, then you went and got your spare key, then the vehicle started?

Did you ever attempt to start the vehicle using the other key that you assumed didn't work anymore?

If the current battery installed in the vehicle has twice become so deeply discharged that it wouldn't start...determine how old that battery is and perhaps consider that it is D O N E...and it's time for a new battery.

When the vehicle doesn't start...have you unlocked the cluster to do TEST 9 to see what the vehicle battery's voltage is? If it is below 11.89 volts...and the battery is old (like 4-6 years old)...this could be the reason for the no start...and not the remote key.

EWS is the immobilizing system that inhibits starting of the vehicle...and it operates on a totally different frequency and uses different control module vs the central locking and arming of the alarm system (FZV & DWA). Can you still perform FZV & DWA using the remote key (doors lock/unlock and the alarm siren system is activated/deactivated)? When DWA is activated, the litter red clown nose (DWA status LED) illuminates.

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